There is field evidence of ball pythons eating young birds. I also am guessing that in your area the use of massive hormones isn't quite as rampant as it is here in the Americas I know much of europe isn't as bad.

I can't speak about poop as I have never tried chicks, I can see runny poo if the animal was switched from one food to another and was not given time to adjust I am guessing but the snakes may adjust and have normal poo. I am however just guessing.

look at this...

http://elibrary.unm.edu/sora/jrr/v01...045-p00049.pdf

based on that I might give some thought to a bit of reptile supplement on the chicks just to make up the differences.